Check the ingredients and see if it actually has 1,3DMAA in it. I know the FDA has banned/is in the process of banning it and I believe the newer batches of Jack3d are made without it.

Also you get a tolerance to it really quick. I take 4 scoops a day now, so I needed to take a break from it anyway.

It has. I's from the older batches. I don't have the balls to take more that 1 and half scoop. I've heard some guys being fuc*k*ed up by doing so. Some kid even died around here by taking 5 scoops a day.